<script type="module">

    // Import the functions you need from the SDKs you need

    import { initializeApp } from "https://www.gstatic.com/firebasejs/9.8.0/firebase-app.js";

    import { getFirestore } from "https://www.gstatic.com/firebasejs/9.8.0/firebase-firestore.js";

​

    // Your web app's Firebase configuration\

    const firebaseConfig = {

        apiKey: "API_KEY",

        authDomain: "PROJECT_ID.firebaseapp.com",

        // The value of `databaseURL` depends on the location of the database

        databaseURL: "https://DATABASE_NAME.firebaseio.com",

        projectId: "PROJECT_ID",

        storageBucket: "PROJECT_ID.appspot.com",

        messagingSenderId: "SENDER_ID",

        appId: "APP_ID",

        // For Firebase JavaScript SDK v7.20.0 and later, `measurementId` is an optional field

        measurementId: "G-MEASUREMENT_ID"

    };

​

    // Initialise Firebase

    const app = initializeApp(firebaseConfig);

    // Initialise Firestore

    const db = getFirestore(app);

​

    // create a document with a randomly generated id

    async function CreateDocument(collectionName, object) {

        try {

            // add a document to the input collection with the fields in `object`

            return await addDoc(collection(db, collectionName), object);

        } catch (err) {

            console.error("Error writing to database:", err);

            return err;

        }

    }

​

    async function UpdateDocument(collectionName, documentName, object) {

        try {

            // update a document in the input collection with the input id with the fields in `object`

            await updateDoc(doc(db, collectionName, documentName), object);

        } catch (err) {

            console.error("Error writing to database:", err);

            return err;

        }

    }

​

    const docId = (await CreateDocument("COLLECTION_NAME", {

        "field-1": 1,

        "field-2": "Hello world",

        "another field": "https://firebase.google.com/docs/database/web/read-and-write"

    })).id;

​

    await UpdateDocument("COLLECTION_NAME", docId, {

        "field-1": 2,

        "field-3": [ 1, 2, 3, 4 ]

    });

</script>